Hello! Please make sure to check all these boxes before submitting a Pull Request
(PR). Once you have checked the boxes, feel free to remove all text except the
justification in point 5. 

1. [ ] You have run tests on this submission, either by using [Travis Continuous Integration testing](https://github.com/pysal/pysal/wiki/GitHub-Standard-Operating-Procedures#automated-testing-w-travis-ci) testing or running `nosetests` on your changes?
2. [ ] This pull request is directed to the `pysal/master` branch. **This is important, as any PRs submitted against any other branches will be delayed.**
3. [ ] This pull introduces new functionality covered by
   [docstrings](https://en.wikipedia.org/wiki/Docstring#Python) and
   [unittests](https://docs.python.org/2/library/unittest.html)? 
4. [ ] You have [assigned a
   reviewer](https://help.github.com/articles/assigning-issues-and-pull-requests-to-other-github-users/) and added relevant [labels](https://help.github.com/articles/applying-labels-to-issues-and-pull-requests/)
5. [ ] The justification for this PR is: 
